package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

public class LoginDemo {
    /*
    用户登录功能
    程序启动后要求用户输入用户名和密码
    然后比对userinfo表中是否存在该用户，如果匹配则提示登陆成功
    否则提示：用户名或密码不正确
    登录逻辑：只有用户名密码都正确才算登陆成功
     */
    public static void main(String[] args) {
        UserInfo userInfo = InputUtil.getInputObject(new UserInfo());
        try (
                Connection connection = DBUtil.getConnection();
                ){
            Statement statement = connection.createStatement();
            String sql = "SELECT id,username,password,nickname,age FROM userinfo WHERE username='"+userInfo.getUsername()+"' AND password='"+userInfo.getPassword()+"'";
            ResultSet result = statement.executeQuery(sql);
            if(result.next()){
                System.out.println("登陆成功,欢迎你"+result.getString("nickname"));
            }else{
                System.out.println("用户名或密码不正确");
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
